Power factor correction circuit and power supply device
First Claim
1. A power factor correction circuit capable of switching an operation mode, the circuit comprising:
- first and second input terminals for inputting an input voltage;
first and second output terminals;
a coil;
a switch circuit that, boosts the input voltage to generate a boosted voltage in cooperation with the coil;
a first capacitor having one end connected to the first output terminal, and the other end connected to an intermediate node; and
a second capacitor having one end connected, to the intermediate node, and the other end connected to the second output terminal, whereinwhen a potential at the first input terminal is higher than a potential at the second input terminal in a first operation mode, the boosted voltage is applied to the two ends of the first capacitor such that a potential at the one end is higher than a potential at the other end,when the potential at the first input terminal is lower than the potential at the second input terminal in the first operation mode, the boosted voltage is applied to the two ends of the second capacitor such that a potential at the one end is higher than a potential at the other end, andin a second operation mode, the boosted voltage is applied to two ends of the first and second capacitors connected in series such that the potential at the one end of the first capacitor is higher than the potential at the other end of the second capacitor.
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Accused Products
Abstract
A power factor correction circuit includes: a coil and MOSFETs that boost an input voltage to generate a boosted voltage; a first capacitor having one end connected to a first output terminal, and the other end connected to an intermediate node; and a second capacitor having one end connected to the intermediate node, and the other end connected to a second output terminal. In a first operation mode, the boosted vol tage is applied to the two ends of the first capacitor when a positive voltage is input, and applied to the two ends of the second capacitor when a negative voltage is input. In a second operation mode, the boosted voltage is applied to two ends of the first and second capacitors connected in series. Thus, there is provided a power factor correction circuit which has a high efficiency and is compatible with an input voltage in a broad range.
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Citations
20 Claims
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1. A power factor correction circuit capable of switching an operation mode, the circuit comprising:
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first and second input terminals for inputting an input voltage; first and second output terminals; a coil; a switch circuit that, boosts the input voltage to generate a boosted voltage in cooperation with the coil; a first capacitor having one end connected to the first output terminal, and the other end connected to an intermediate node; and a second capacitor having one end connected, to the intermediate node, and the other end connected to the second output terminal, wherein when a potential at the first input terminal is higher than a potential at the second input terminal in a first operation mode, the boosted voltage is applied to the two ends of the first capacitor such that a potential at the one end is higher than a potential at the other end, when the potential at the first input terminal is lower than the potential at the second input terminal in the first operation mode, the boosted voltage is applied to the two ends of the second capacitor such that a potential at the one end is higher than a potential at the other end, and in a second operation mode, the boosted voltage is applied to two ends of the first and second capacitors connected in series such that the potential at the one end of the first capacitor is higher than the potential at the other end of the second capacitor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A power factor correction circuit comprising:
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first and second input terminals; first and second output terminals; a coil; a bidirectional switch that includes first and second transistors connected in anti-series, the bidirectional switch having one end connected to a first node, and the other end connected to a second node; a first capacitor having one end connected to the first output terminal, and the other end connected to the second node; a second capacitor having one end connected to the second node, and the other end connected to the second output terminal; a first rectifier element connected between the first node and the one end of the first capacitor so as to allow a current to flow from a first node side; and a second rectifier element connected between the first node and the other end of the second capacitor so as to allow a current to flow to the first node side, wherein the power factor correction circuit has a current path between the first and second input terminals via the coil and the bidirectional switch, and the coil is connected, at least one of between the first input terminal and the first node, and between the second node and the second, input terminal. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. A power factor correction circuit comprising:
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first and second input terminals; first and second output terminals; a coil; a first bidirectional switch that includes first and second transistors connected in anti-series, the first bidirectional switch having one end connected to a first node, and the other end connected to a second node; a first capacitor having one end connected to the first output terminal, and the other end connected to a third node; a second capacitor having one end connected to the third node, and the other end connected to the second output terminal; a second bidirectional switch connected between the second node and the third node; a first rectifier element connected between the first node and the one end of the first capacitor so as to allow a current to flow from, a first node side; a second, rectifier element connected between, the first node and the other end of the second capacitor so as to allow a current to flow to the first node side; a third rectifier element connected between the second node and the one end of the first capacitor so as to allow a current to flow from a second node side; and a fourth rectifier element connected between the second node and the other end of the second capacitor so as to allow a current to flow to the second node side, wherein the power factor correction circuit has a current path between the first and second input terminals via the coil and the first bidirectional switch, and the coil is connected at least one of between the first input terminal and the first node, and between, the second node and the second input terminal.
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Specification